I am trying to get the email of the commenter in an app using Firebase database. I can get the comments from the same database/chiled, but the email is always null, without any crash from the app. The following are the codes used with a screenshot of the problem.
Comment.java:
package sa.edu.qu.coc.cocapps.blog;
public class Comment {
private String comment, commentEmail;
public Comment() {
}
public Comment(String comment, String commentEmail) {
this.comment = comment;
this.commentEmail = commentEmail;
}
public String getComment() {
return comment;
}
public void setComment(String comment) {
this.comment = comment;
}
public String getCommentEmail() {
return commentEmail;
}
public void setCommentEmail(String commentEmail) {
this.commentEmail = commentEmail;
}
}
CommentsActivity.java:
The problem actually is in this line: viewHolder.commentEmail.setText("Commented by: " + model.getCommentEmail());
package sa.edu.qu.coc.cocapps.blog;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.util.TypedValue;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
import sa.edu.qu.coc.cocapps.R;
import sa.edu.qu.coc.cocapps.login.MainActivity;
import sa.edu.qu.coc.cocapps.prefs.PreferencesActivity;
public class CommentsActivity extends AppCompatActivity implements View.OnClickListener {
private Toolbar toolbar = null;
private FloatingActionButton fab;
private FirebaseAuth firebaseAuth;
private FirebaseUser firebaseUser;
private Comment comment;
private RecyclerView commentsRecyclerView;
private EditText postComment;
private ProgressDialog progressDialog;
private DatabaseReference commentsDatabaseReference;
private String postKey = null;
private SharedPreferences prefs;
private Activity activity;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
activity = this;
prefs = getSharedPreferences(PreferencesActivity.PREFS_KEY, Context.MODE_PRIVATE);
switch (prefs.getInt("appColor", 0)) {
case 0:
activity.setTheme(R.style.AppTheme);
break;
case 1:
activity.setTheme(R.style.GrayTheme);
break;
case 2:
activity.setTheme(R.style.BlueTheme);
break;
case 3:
activity.setTheme(R.style.MagentaTheme);
break;
}
setContentView(R.layout.activity_comments);
firebaseAuth = FirebaseAuth.getInstance();
firebaseUser = firebaseAuth.getCurrentUser();
if (firebaseUser == null) {
// Not signed in, launch the MainActivity.
Intent intent = new Intent(this, MainActivity.class);
// To prevent the user from going back to the "CommentsActivity".
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
finish();
return;
}
postKey = getIntent().getExtras().getString("post_id");
commentsDatabaseReference = FirebaseDatabase.getInstance().getReference().child("Comments");
commentsDatabaseReference.keepSynced(true);
initViews();
initCommentsSection();
setSupportActionBar(toolbar);
switch (prefs.getInt("appColor", 0)) {
case 0:
activity.setTheme(R.style.AppTheme);
break;
case 1:
toolbar.setBackgroundColor(Color.GRAY);
break;
case 2:
toolbar.setBackgroundColor(Color.BLUE);
break;
case 3:
toolbar.setBackgroundColor(Color.MAGENTA);
break;
}
fab.setOnClickListener(this);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
private void initViews() {
toolbar = (Toolbar) findViewById(R.id.toolbar);
fab = (FloatingActionButton) findViewById(R.id.fab);
}
private void initCommentsSection() {
commentsRecyclerView = (RecyclerView) findViewById(R.id.commentsRecyclerView);
commentsRecyclerView.setHasFixedSize(true);
commentsRecyclerView.setLayoutManager(new LinearLayoutManager(this));
FirebaseRecyclerAdapter<Comment, CommentHolder> commentAdapter = new
FirebaseRecyclerAdapter<Comment, CommentHolder>(
Comment.class,
R.layout.row_comment,
CommentHolder.class,
commentsDatabaseReference.child(postKey)) {
@Override
protected void populateViewHolder(CommentHolder viewHolder,
Comment model, int position) {
viewHolder.comment.setText(model.getComment());
viewHolder.commentEmail.setText("Commented by: " + model.getCommentEmail());
switch (prefs.getInt("fontSize", 0)) {
case 0:
viewHolder.comment.setTextSize(TypedValue.COMPLEX_UNIT_SP, 14);
viewHolder.commentEmail.setTextSize(TypedValue.COMPLEX_UNIT_SP, 14);
return;
case 1:
viewHolder.comment.setTextSize(TypedValue.COMPLEX_UNIT_SP, 16);
viewHolder.commentEmail.setTextSize(TypedValue.COMPLEX_UNIT_SP, 16);
return;
case 2:
viewHolder.comment.setTextSize(TypedValue.COMPLEX_UNIT_SP, 18);
viewHolder.commentEmail.setTextSize(TypedValue.COMPLEX_UNIT_SP, 18);
return;
case 3:
viewHolder.comment.setTextSize(TypedValue.COMPLEX_UNIT_SP, 20);
viewHolder.commentEmail.setTextSize(TypedValue.COMPLEX_UNIT_SP, 20);
return;
case 4:
viewHolder.comment.setTextSize(TypedValue.COMPLEX_UNIT_SP, 22);
viewHolder.commentEmail.setTextSize(TypedValue.COMPLEX_UNIT_SP, 22);
return;
}
}
};
commentsRecyclerView.setAdapter(commentAdapter);
postComment = new EditText(this);
postComment.setHint(R.string.write_your_comment);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.fab:
if (postComment.getParent() != null)
((ViewGroup) postComment.getParent()).removeView(postComment);
postComment.setText("");
AlertDialog.Builder commentDialog = new AlertDialog.Builder(this)
.setTitle(R.string.what_are_you_thinking_about)
.setIcon(R.mipmap.write_comment)
.setView(postComment)
.setPositiveButton(R.string.send, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if(postComment.getText() == null ||
postComment.getText().toString().equals("") ||
postComment.getText().toString().equals(" ") ||
postComment.getText().toString().isEmpty())
Snackbar.make(findViewById(R.id.root_activity_comments),
R.string.the_comment_cannot_be_empty,
Snackbar.LENGTH_LONG).show();
else
sendComment();
}
})
.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// Do not do anything.
}
});
commentDialog.show();
break;
}
}
private void sendComment() {
progressDialog = new ProgressDialog(this);
progressDialog.setMessage(getString(R.string.commenting));
progressDialog.show();
comment = new Comment(postComment.getText().toString(), firebaseUser.getEmail());
commentsDatabaseReference.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
DatabaseReference newComment = commentsDatabaseReference.child(postKey).push();
newComment.child("comment").setValue(comment.getComment());
newComment.child("email").setValue(comment.getCommentEmail());
newComment.child("postKey").setValue(postKey)
.addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
if (task.isSuccessful()) {
progressDialog.dismiss();
Toast.makeText(CommentsActivity.this, R.string.posted,
Toast.LENGTH_SHORT).show();
}
}
});
// TO DO: 1. Solve the problem of displaying email in comments.
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
protected static class CommentHolder extends RecyclerView.ViewHolder {
private TextView comment, commentEmail;
public CommentHolder(View itemView) {
super(itemView);
comment = (TextView) itemView.findViewById(R.id.commentTextView);
commentEmail = (TextView) itemView.findViewById(R.id.commentEmail);
}
}
@Override
public boolean onSupportNavigateUp() {
onBackPressed();
return true;
}
}
And as you can see, the email is stored in the database without any problem.
I tried to use some solutions, like if(something != null) // Do following... but it still null, and some other Firebase related solutions, but also it still the same problem. So, I made this post looking for a solution.
